Cream together the butter and sugar.
Add eggs one at a time.
Beat until smooth.
Sift together the cake meal, potato starch, and salt.
Fold the dry mixture into the egg mixture.
Mix thoroughly.
Add the chocolate chips and nuts.
Form into 4 loaves and place on a parchment lined cookie sheet.
Sprinkle top with a mix of 2 tsp. sugar and 1 tsp. cinnamon.
Bake 40-45 minutes at 350°F.